OFFSET
1,2
FORMULA
EXAMPLE
For n = 4; divisors of 4: {1, 2, 4}; subsets of divisors of n: {}, {1}, {2}, {4}, {1, 2}, {1, 4}, {2, 4}, {1, 2, 4}; product of products of elements of subsets = 1*1*2*4*2*4*8*8 = 4096.
MATHEMATICA
Table[Times@@Times@@@Subsets[Divisors[n]], {n, 20}] (* Harvey P. Dale, Mar 05 2015 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Sep 20 2013
STATUS
approved